NAUI Diver Master Exam (Latest 2024/ 2025
Update) Questions and Verified Answers| 100%
Correct| Grade A
what pressure will a scuba cylinder with a rated working pressure of 3000 psi (207
bar) be exposed to during a hydrostatic test? - ANSWER5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba cylinders? -
ANSWERpermanent expansion
if a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require
cleaning by a process called - ANSWERtumbling
which of the following is considered proper care of a scuba cylinder? -
ANSWERpreventing moisture from entering the cylinder
two cylinder valves in common use today are - ANSWERthe k-valve and din valve
which valve is an example of a special scuba valve that is required for certain types
of specialty diving such as deep diving with a single cylinder? - ANSWERy valve
which internal valve designs are available in the first stage of scuba regulators? -
ANSWERpiston; diaphragm
which valve is unaffected by cylinder air pressure with regard to the force needed to
operate the valve? - ANSWERbalanced
which regulator second stage design uses air pressure rather than mechanical
leverage to open the main valve? - ANSWERpilot
in the event of a regulator first stage malfunction, which type of valve design would
be likely to eliminate air flow to the diver? - ANSWERupstream
when considering a regulator for purchase or use, an important point to remember
is that certain regulators may not be capable of delivering ____ flow rates at ____
cylinder pressure during an air sharing emergency - ANSWERhigh; low
which diving instrument incorporates a Bourdon tube mechanism? -
ANSWERcylinder pressure gauges
two benefits derived from using an electronic dive computer are - ANSWERaccurate
monitoring of ascent rate and, if executing a multi-level diving profile, avoidance of
the maximum time/depth penalty
, green discoloration on the first stage of a scuba regulator indicates - ANSWERwater
has most likely entered the first stage
an air compressor used for filling scuba cylinders operates by the principle of -
ANSWERBoyle's Law
dry suits form a waterproof barrier, but require undergarments to be effective in
cold water - ANSWERtrue
in order to make an informed decision on equipment purchase, you need to have a
solid educational background concerning the ____ of diving equipment -
ANSWERtypes, method of operation, care and maintenance
the distance between successive wave crests is defined as - ANSWERwavelength
the highest tides are called ____ tides, and the lowest tides are called ____ tides -
ANSWERspring; neap
water rocking back and forth in a lake or a bay is defined as - ANSWERseiching
the effect of the moon on tidal action is about - ANSWERtwice the effect of the sun
the type of breaking wave that produces the greatest force when breaking is the
_____ breaker - ANSWERplunging
if the water conditions are reasonable to make a beach dive, all of the following
procedures are suggested except - ANSWERentering the water as slowly as possible
immediately after a wave breaks, getting beyond the surf zone quickly, before the
next wave breaks
when waves break on shore and the backrush is funneled through a narrow opening,
the condition is known as - ANSWERa rip current
currents in bodies of water are formed by - ANSWERsurface winds, the rotation of
the earth, the influence of the sun and moon
water of equal temperature at all levels is most likely to be found in a lake during -
ANSWERspring
the horizontal boundary between waters of differing salinity is defined as a -
ANSWERhalocline
the four basic plant and animal life zones in the ocean are - ANSWERlittoral,
planktonic, nektonic, benthic
a marine animal whose tissues are toxic, either in part or entirety is -
ANSWERpoisonous
Update) Questions and Verified Answers| 100%
Correct| Grade A
what pressure will a scuba cylinder with a rated working pressure of 3000 psi (207
bar) be exposed to during a hydrostatic test? - ANSWER5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba cylinders? -
ANSWERpermanent expansion
if a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require
cleaning by a process called - ANSWERtumbling
which of the following is considered proper care of a scuba cylinder? -
ANSWERpreventing moisture from entering the cylinder
two cylinder valves in common use today are - ANSWERthe k-valve and din valve
which valve is an example of a special scuba valve that is required for certain types
of specialty diving such as deep diving with a single cylinder? - ANSWERy valve
which internal valve designs are available in the first stage of scuba regulators? -
ANSWERpiston; diaphragm
which valve is unaffected by cylinder air pressure with regard to the force needed to
operate the valve? - ANSWERbalanced
which regulator second stage design uses air pressure rather than mechanical
leverage to open the main valve? - ANSWERpilot
in the event of a regulator first stage malfunction, which type of valve design would
be likely to eliminate air flow to the diver? - ANSWERupstream
when considering a regulator for purchase or use, an important point to remember
is that certain regulators may not be capable of delivering ____ flow rates at ____
cylinder pressure during an air sharing emergency - ANSWERhigh; low
which diving instrument incorporates a Bourdon tube mechanism? -
ANSWERcylinder pressure gauges
two benefits derived from using an electronic dive computer are - ANSWERaccurate
monitoring of ascent rate and, if executing a multi-level diving profile, avoidance of
the maximum time/depth penalty
, green discoloration on the first stage of a scuba regulator indicates - ANSWERwater
has most likely entered the first stage
an air compressor used for filling scuba cylinders operates by the principle of -
ANSWERBoyle's Law
dry suits form a waterproof barrier, but require undergarments to be effective in
cold water - ANSWERtrue
in order to make an informed decision on equipment purchase, you need to have a
solid educational background concerning the ____ of diving equipment -
ANSWERtypes, method of operation, care and maintenance
the distance between successive wave crests is defined as - ANSWERwavelength
the highest tides are called ____ tides, and the lowest tides are called ____ tides -
ANSWERspring; neap
water rocking back and forth in a lake or a bay is defined as - ANSWERseiching
the effect of the moon on tidal action is about - ANSWERtwice the effect of the sun
the type of breaking wave that produces the greatest force when breaking is the
_____ breaker - ANSWERplunging
if the water conditions are reasonable to make a beach dive, all of the following
procedures are suggested except - ANSWERentering the water as slowly as possible
immediately after a wave breaks, getting beyond the surf zone quickly, before the
next wave breaks
when waves break on shore and the backrush is funneled through a narrow opening,
the condition is known as - ANSWERa rip current
currents in bodies of water are formed by - ANSWERsurface winds, the rotation of
the earth, the influence of the sun and moon
water of equal temperature at all levels is most likely to be found in a lake during -
ANSWERspring
the horizontal boundary between waters of differing salinity is defined as a -
ANSWERhalocline
the four basic plant and animal life zones in the ocean are - ANSWERlittoral,
planktonic, nektonic, benthic
a marine animal whose tissues are toxic, either in part or entirety is -
ANSWERpoisonous
